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USB 2.0 details & connector information
USB 2.0 is a Universal Serial Bus (USB) standard. Almost all devices with USB capabilities, and nearly all USB cables, support at least USB 2.0 (often called Hi-Speed USB).
Devices that adhere to this USB standard have the ability to transmit data at a maximum speed of 480 Mbps. This is faster than the older USB 1.1 standard and much slower than the newer USB4 standard.
USB 1.1 was released in August 1998, USB 2.0 in April 2000, USB 3.0 in November 2008, and USB4 in August 2019.
Plug is the name given to the male connector on a USB 2.0 cable or flash drive, while the receptacle is the name given to the female connector on a USB 2.0 device or extension cable.
Only USB 2.0 supports USB Mini-A, USB Mini-B, and USB Mini-AB connectors.
You may want to consult a USB Physical Compatibility Chart for a reference on what-fits-with-what.
Older USB 1.1 devices and cables are, for the most part, physically compatible with USB 2.0 hardware. However, the only way to reach USB 2.0 transmission speeds is if all devices and cables being connected to each other support USB 2.0.
If, for example, you have a USB 2.0 device used with a USB 1.0 cable, the 1.0 speed will be used regardless of the fact that the device supports USB 2.0 since that cable doesn't support the newer, faster speeds.
USB 2.0 devices and cables used with USB 3.0 devices and cables, assuming they're physically compatible, will operate at the lower USB 2.0 speed.
In other words, the transmission speed falls to the older of the two technologies. This makes sense, since you can't pull USB 3.0 speeds out of a USB 2.0 cable, nor can you get USB 2.0 transmission speeds using a USB 1.1 cable.
USB On-the-Go was released in December 2006. It allows devices to switch between acting as a host and as a subordinate when necessary so that they can be connected to each other directly.
For example, a USB 2.0 smartphone or tablet might be able to pull data off of a flash drive as a host but then switch over to subordinate mode when connected to a computer so that information can be taken from it.
The device that supplies power (the host) is considered the OTG A-device, while the one that consumes power (the subordinate) is called the B-device. The subordinate acts as the peripheral device in this type of setup.
Switching roles is performed by using the Host Negotiation Protocol (HNP), but physically choosing which USB 2.0 device should be considered the subordinate or host by default is as easy as choosing which end of the cable the device is connected to.
Occasionally, HNP polling will take place by the host to determine if the subordinate is requesting to be the host, in which case they can swap places. USB 3.0 uses HNP polling as well, but it's called Role Swap Protocol (RSP).
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